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2013 Pinehurst Lake Report

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2013 Pinehurst Lake Report THE ALBERTA LAKE MANAGEMENT SOCIETY VOLUNTEER LAKE MONITORING PROGRAM 2013 Pinehurst Lake Report COMPLETED WITH SUPPORT FROM: Alberta Lake Management Society’s LakeWatch Program LakeWatch has several important objectives, one of which is to collect and interpret water quality data on Alberta Lakes. Equally important is educating lake users about their aquatic environment, encouraging public involvement in lake management, and facilitating cooperation and partnerships between government, industry, the scientific community and lake users. LakeWatch Reports are designed to summarize basic lake data in understandable terms for a lay audience and are not meant to be a complete synopsis of information about specific lakes. Additional information is available for many lakes that have been included in LakeWatch and readers requiring more information are encouraged to seek those sources. ALMS would like to thank all who express interest in Alberta’s aquatic environments and particularly those who have participated in the LakeWatch program. These people prove that ecological apathy can be overcome and give us hope that our water resources will not be the limiting factor in the health of our environment. Acknowledgements The LakeWatch program is made possible through the dedication of its volunteers. We would like to thank Samantha Sinclair, Matthew Warawa, and Amanda Lea with Lac La Biche County for their assistance with sampling in 2013. We would also like to thank Jared Ellenor, Nicole Meyers, and Elynne Murray who were summer technicians with ALMS in 2013. Program Coordinator Bradley Peter was instrumental in planning and organizing the field program. Technologists Chris Ware and Sarah Hustins were involved in the training aspects of the program. Lisa Reinbolt was responsible for data management. This report was prepared by Bradley Peter and Arin Dyer. Alberta Environment and the Beaver River Watershed Alliance (BRWA) were major sponsors of the program. PINEHURST LAKE: Pinehurst Lake is located 20km south of Lac La Biche and 245 km northeast of Edmonton, in Lakeland Provincial Recreation Area just east of the Lakeland Provincial Park. The name Pinehurst is derived from the jack pine tree and from the English word "hurst", which means "a wooded hillock". This term refers to the long ridge that runs along the northwest shore of the lake. At one Figure 1 - Pinehurst Lake. Photo by Nicole time, jack pine may have grown Meyers. along the ridge, but forest fires have removed most of this species1. Pinehurst Lake has a water surface of 40.7 km2, a mean depth of 12m and a maximum depth of 21.3m. It has a relatively complex shoreline with several bays and two islands just offshore. The bays at the east end of the lake are very shallow (less than 6-m deep) and the bottom of the basin slopes gently. The bay at the north end is somewhat deeper (less than 12-m deep) and its sides slope more steeply. A large area in the centre of the basin is quite level, and ranges in depth from 18 to 21.3 m.2 The lake has a watershed that is approximately 7 times its size, 285 km2, and includes Touchwood Lake and its watershed (Fig 1). A large permanent stream drains Touchwood into Pinehurst. Figure 2 - Pinehurst Lake and its Pinehurst drains by Punk Creek into watershed. the Sand River, a tributary in the Beaver River basin. The Watershed is almost completely forested and is representative of the central mixed natural subregion with aspen dominant in early seral stages and white spruce increasing with forest age. Black 1 Chipeniuk, R.C. 1975. Lakes of the Lac la Biche District. R.C. Chipeniuk, Lac La Biche. 2 University of Alberta. 2005. Atlas of Alberta Lakes. University of Alberta Press. Available at: http://sunsite.ualberta.ca/Projects/Alberta-Lakes/ spruce and tamarack on extensive peatlands and sedge bogs are common in this watershed. Recreational development includes an Alberta Provincial Park campsite accessible by road on the western shore and a boat-in only, privately owned cabin rentals on the eastern shore. Pinehurst Lake is a favourite destination for local anglers but restrictive sport fishing regulations have been implemented at the lake to improve the health of the fish populations. Snug Cove (Mud Bay) has been closed to fishing and for the remainder of the lake walleye may only be fished with a Special Fish Harvest License. Pike and perch may be fished in limited numbers and sizes.3 Commercial fishing has not occurred since the seventies. WATER QUANTITY: There are many factors influencing water quantity. Some of these factors include the size of the lakes drainage basin, precipitation, evaporation, water consumption, ground water influences, and the efficiency of the outlet channel structure at removing water from the lake. Requests for water quantity monitoring should go through Environment and Sustainable Resource Developments Monitoring and Science division. Currently no long term water quantity data exists for Pinehurst Lake. WATER CLARITY AND SECCHI DEPTH: Water clarity is influenced by suspended materials, both living and dead, as well as dissolved colored compounds in the water column. During the melting of snow and ice in spring, lake water can become turbid (cloudy) from silt transported into the lake. Lake water usually clears in late spring but then becomes more turbid with increased algal growth as the summer progresses. The easiest and most widely used measure of lake water clarity is the Secchi disk depth. Average Secchi disk depth in Pinehurst Lake measured 2.68 m over the summer of 2013 (Table 1). Secchi disk depth changed little over the course of the summer, suggesting summer algae blooms do not greatly impede water clarity at Pinehurst Lake. Secchi disk depth measured a maximum of 3.50 m on July 31st and a minimum of 2.00 m on September 10th (Figure 3). 3 Government of Alberta. 2013. Guide to Sportfishing Regulations. Available at: http://www.albertaregulations.ca/fishingregs/nb1.html. Date 1 2 3 Secchi Depth (m) 4 5 Figure 3 – Secchi disk depths measured five times over the course of the summer at Pinehurst Lake, 2013. WATER TEMPERATURE AND DISSOLVED OXYGEN: Water temperature and dissolved oxygen profiles in the water column can provide information on water quality and fish habitat. The depth of the thermocline is important in determining the depth to which dissolved oxygen from the surface can be mixed. Please refer to the end of this report for descriptions of technical terms. Despite its deep depth, temperatures in June suggest the entire water column mixes, at least in the spring. On June 13th no thermal stratification was observed – surface temperatures measured 13.08 °C while temperature at the sediment measured 6.12 °C (Figure 4a). By July 5th, however, thermal stratification had established at 5.0 m depth. This stratification remained throughout the rest of the summer – there was no evidence of lake turnover by the last sample taken on September 10th. Dissolved oxygen concentrations were typical of a deep, stratified lake (Figure 4b). Pinehurst was well oxygenated at the surface, measuring over 9.00 mg/L on each sampling trip. However, oxygen concentrations declined with the presence of the thermocline, resulting in anoxia as early as 10.5 m on September 10th. The decomposition of cyanobacteria/algae on the lakebed, as well as separation by the thermocline from atmospheric oxygen, contribute to the decline in oxygen below the thermocline. A lack of oxygen near the lakebed likely promotes the release of phosphorus from the sediments which would be distributed throughout the water column when stratification breaks down. a) b) Temperature (°C) Dissolved Oxygen (mg/L) 0.00 10.00 20.00 30.00 0 5 10 15 0.0 0 5.0 5 10.0 10 15.0 15 Depth (m) Depth (m) 20.0 20 13-Jun 13-Jun 5-Jul 5-Jul 25.0 31-Jul 25 31-Jul 16-Aug 16-Aug 30.0 10-Sep 30 10-Sep Figure 4 – a) Temperature (°C) and b) dissolved oxygen (mg/L) profiles measured in Pinehurst Lake during WATER CHEMISTRY: ALMS measures a suite of water chemistry parameters. Phosphorus, nitrogen, and chlorophyll-a are important because they are indicators of eutrophication, or excess nutrients, which can lead to harmful algal/cyanobacteria blooms. One direct measure of harmful cyanobacteria blooms are Microcystins, a common group of toxins produced by cyanobacteria. See Table 2 for a complete list of parameters. Average total phosphorus measured 26.6 µg/L in 2013 – this value falls into the mesotrophic, or moderately productive, classification (Table 1). An average value of 26.6 µg/L is low compared to the 1986 average of 45.67 µg/L – more samples are required to account for environmental variability between years. A maximum TP concentration was observed on July 5th at 34 µg/L and a minimum concentration was observed on August 16th and September 10th at 25 µg/L. Average Total Kjeldahl Nitrogen (TKN) concentration measured 946.6 µg/L in 2013. Similar to TP, this value is well below the average measured in 1986. Throughout the summer, TKN fluctuated between a minimum of 873 µg/L on July 31st to a maximum of 1010 µg/L on June 13th. Finally, average chlorophyll-a concentration measured 4.968 µg/L in 2013. This average is low and falls into the mesotrophic classification. Concentration of chlorophyll-a peaked early in the season, measuring 8.29 µg/L on June 13th. A minimum concentration of chlorophyll-a was observed on July 5th at 2.34 µg/L. Historical data suggests the phytoplankton community at Pinehurst has been dominated by cyanobacteria, specifically Oscillatoria agardhii2. However, in 2013, cyanobacteria did not appear to exist in significant densities.
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